Fix all flake8 problems.
Fix all flake8 problems.

Change-Id: Ibd36add2530a144122a0c3a88f31b3df1b838d24

srznew/heat,jasondunsmore/heat,miguelgrinberg/heat,pratikmallya/heat,dragorosson/heat,dragorosson/heat,cwolferh/heat-scratch,dims/heat,miguelgrinberg/heat,noironetworks/heat,openstack/heat,cryptickp/heat,pshchelo/heat,rh-s/heat,pshchelo/heat,steveb/heat,maestro-hybrid-cloud/heat,gonzolino/heat,gonzolino/heat,takeshineshiro/heat,jasondunsmore/heat,rdo-management/heat,pratikmallya/heat,cryptickp/heat,maestro-hybrid-cloud/heat,takeshineshiro/heat,dims/heat,steveb/heat,redhat-openstack/heat,openstack/heat,cwolferh/heat-scratch,redhat-openstack/heat,rh-s/heat,srznew/heat,noironetworks/heat,rdo-management/heat